Electric lamp for vehicles.



K. H. THOMPSON.

LLECTMG LAMP P01: mnmm APPLICATION TILED Patented Dec. 8. 1914.

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Specification of Letters Patent.

, Application filed February iii-1914. Serial No, 818,882.

To all whom it mag concern Be it known that I, Kn'ien'r Hi TnoMrsoN, acitizen of the United States of America,

residing at Shelby, in the countyi of Richlandand State of Ohio,haveinvented certain new and usefiul Improvements in Electric improvementsin electric lamps for vehicles.

The object'ofthis invention is to provide new and improvcd'means formounting the light bulb inth'e lamp so that the bulb may be readilyremoved from the lamp, without opening the front of the lamp ordlSCOIlllGClZ .ing any of the wires supplying the current to the lamp.

My invention, therefore, consists in the features of construction andcombination of parts hereinafter described in the specification','pointed out in theclaimsand illustrated in theaccompanying'drawings;

Referring. to said drawings, Figure 1 is a central section through alamp embodying my invention. Fig. 2 is a section on line 22, Fig. 1.Fig. 3 is a section on line 3+3, 1 80 F I Kgain referring to thedrawings, .5 rcpresents the casing or shell of my improved lamp which,as shown in the drawing, is cincular in shape and is preferably made ofmetal as to be a conductor for electricity. At the tront of the casingis mounted a ring 7 whicli is secured in the casing by means of screws8. The said ring 3' forms the mounting for the glass or lens 9 which maybe hel therein in any suitable manner. In the back of the lamp casing isformed a circular opening '10 and on the hack of the casing around-saidopening 10 is forinedanin;

teriorly-screw-thread ed boss 11. A plug 12 having an exterior screwthread corresponding to the thread on the boss 11 is screwed intothei'said boss. This plug 12 is preferably prdvided with a head 13 inorder that it may lie readily manipulated. The plug is provic ed with achamber 14'. In the said chamber 14 in the plug 12 is arranged a lamprefeiving socket 15 and the inner end thereof s spaced from the backwall of said chamber, -The said socket 15 is provided 5l= ,witl1 aflahge 15' which prevents it from be "in'g shoved too far back inthechaznher l4.

Patented n a,-1eia.

Insaid socket is formed a centrall arranged screw-threadedbore 16 whicex tends from end to end thereofa'nd. the thread in the said bore 1s ofthe standardtype-for receiving. the screw-threaded end-of aj'lam'pbulb,shown 'at 17, Between the lamp socket l5 and the walls of thechamber His ar} ranged an insulating sleeve '18 :which conipletely,insulates the lamp socket-from the said plug. A contactplate 19 isarranged at the back of the chamber 14 in the plug and is adapted toheengaged lbyhoneterminal of the lamp. bulb-when the bulb is v 1 anysuitable. iusulatn -material secured screwed into the. lamp SQGket A.:post 2015f lthe back Well. i the lamp cann'g i-bymeans of a bolt 2-1 sand the $51 .5. bolt emnds h o gh. the said pos on the-en t e eq is monted te minal strip 22 w'hich; s pla e by means of; a nut-23whichsulated from the stripfhy means ofa' 24 of any suitable insulatingmaterial; The

end of thesaid terminalim 9;

the outer end of the lamp socket lfiflAhind-f ing post 26 is niountedonthe Casing and to this binding the wire whic supplies the current,andthe other end 28 of the wire is terminal strip 22;'

It will be readily post is secured one end. 27 of secured, to, the

. as understood that the cur rent will enter the lamp casing from thewire 27, then passLthr-ough thef plug- 12 to one'terminal of the lampbulb, than from the lamp bulb to the lamp socket and through theterminal strip 221 0 the wire 28.

Now, it it is desired to change the lamp bulb it is only necessary tounscrew the plug 12 a from the casing and the old bulb can be readilyremoved and. a new one inserted-in the lamp socket after which the plugis.

screwed back into the lamp casing and allthe connections immediatelyrcstab- What I claims 1. In an electric lamp fof like, the combinationof alamp casing formed of a conducting material, said lamp casing beingprovided with an opening in the wall thereof, a plug arranged to fitinto said; opening, said plug being provided :owitha chamber, a lampsocket arranged "insaid "I101: vehicles andthe chamber in said plug,insulating nater-ia-L arranged between the walls of-saidchainberf andsaid lamp socket, a terminal strip fim mounted within said lamp casingand insulated therefrom and arranged to contact with said lamp socket,-alamp mounted in the lamp socket and having one of its terminals inelectrical COnt it with said plug and the other terminal in electricalcontact with said lamp socket, and means for connecting one terminal ofthe electric circuit directly to the lamp casing and the other terminalof the circuit directly to said terminal strip. v

2. In an electric lamp for vehicles and the like, the combination of alamp casing formed of a conducting material, said lamp beingprovidedwith a screw-threaded opening in one wall thereofia plugarranged to screw into said opening, said plug having a Ichamber formedtherein, a lamp socket havmg a screw-threaded bore'extending therethrough arranged within said chamber and insulated from the walls -ofsaid chamber, a terminal strip mounted within the lamp casing and insul;ted therefrom and 'arranged to make contact with the lamp socket, a lampbulb mounted in the lamp socket and havingto saidterminal strip.

3. In an electric lamp for vehicles and the like, the combination of alamp' casing formed-of a conducting material, said lamp 35 casing beingprovided with :a screw-threaded opening in the wall thereof, ascrew-threaded plng arranged to fit into said opening, said plug beingprovided with a chamber, a contact plate arranged at the baclcof said 40chamber, a lamp socket having a screwthreaded bore extendingtherethrough arranged within said chamber in said plug and I p spacedfrom the rear wall thereof, insula ting material arranged between thewalls of 45 said chamber and said lamp socket, a terminal stripmounted-within said lamp cas ing and insulated therefrom and'arranged tocontact with lamp socket, a lamp bulb-v mounted in the lamp socket andhaving one Q '7 of its terminals in electrical contact with the plate atthe back of said chamber and the other terminal in electrical contactwith said 'lamp socket, and means for connecting one terminal of anelectric C1I Cl11t dl1eCtly to said lamp casing and the other terminalof the circuit directly to said terminal strip.

In testimony whereof, I sign the foregoing specification, inthepresenceof two witnesses.

KNIGHT H. THOMPSON. Witnesses:

Vm'ror. C. LYNCH, B. C. BROWN.

